#TODO: add a rule to setup the cross compiler
# or maybe add it to a bash script instead? im not sure

CC = i686-elf-gcc

DEBUG_FLAGS = -D__TESTING__ -g -Wno-div-by-zero

CFLAGS = -m32 -ffreestanding -Wall -Wextra -Werror -Wpedantic --sysroot=$(PWD)/sysroot -isystem=/usr/include -Iinclude -MD $(DEBUG_FLAGS)

AS = nasm
ASFLAGS = -f elf

LD = i686-elf-ld
LDFLAGS = -T $(shell find . -name "link.ld") -melf_i386 --sysroot=$(PWD)/sysroot -nostdlib -lk -lgcc

AR = i686-elf-ar

TERM_EXEC = kitty --hold sh -c

c_kern_objects := $(patsubst %.c,%.o,$(shell find kernel/ -name "*.c"))
asm_kern_objects := $(patsubst %.s,%.o,$(shell find kernel/ -name "*.s"))



free_objs = $(patsubst %.c,%.o, $(shell find libc/ -path "libc/arch" -prune -o -type f | grep "\.c"))

hosted_objs = $(patsubst, %.c,%.o,$(shell find libc/arch/ -name "*.c"))

libc_objs = $(free_objs) $(hosted_objs)
libk_objs = $(free_objs)

# binaries = libk.a libc.a # Not ready for libc yet
binaries = libk.a

.PHONY: clean all run install-headers install-libs env

all: kernel.elf 

env: install-headers install-libs # TODO: change this to a file specific target, so it doesnt recompile everytime, and so we can move as a prereq on kernel.elf
	util/./gen-clangd.sh

kernel.elf: install-headers install-libs $(c_kern_objects) $(asm_kern_objects)
	$(CC) $(CFLAGS) -T $(shell find . -name "link.ld") -o $@ $(c_kern_objects) $(asm_kern_objects) -nostdlib -lk -lgcc 

os.iso: kernel.elf
	mkdir -p iso/boot/grub
	cp $< iso/boot/kernel.elf
	cp util/grub.cfg iso/boot/grub/grub.cfg
	grub-mkrescue -o $@ iso

run: os.iso
	$(TERM_EXEC) "gdb kernel.elf -x util/gdbcmds" &
	qemu-system-i386 -s -cdrom os.iso

bochs: os.iso
	bochs -f util/bochsrc.txt -q
	
#TODO: when i inevitably do add libc, this is going to fail because they have the same name as the libk objects
#TODO: so we'll need to do a batch rename on one of the two object files,
libc.a: CFLAGS:=$(CFLAGS) -D__is_libc # Target rule to define __is_libc 
libc.a: $(libc_objs)
	$(AR) rcs $@ $(libc_objs)

libk.a: CFLAGS:=$(CFLAGS) -D__is_libk # Target rule to define __is_libk
libk.a: $(libk_objs)
	$(AR) rcs $@ $(libk_objs)

install-headers:
	mkdir -p sysroot/usr/include
	cp -r --preserve=timestamps kernel/include/. sysroot/usr/include/.
	cp -r --preserve=timestamps libc/include/. sysroot/usr/include/.

install-libs: $(binaries)
	mkdir -p sysroot/usr/lib
	cp -r --preserve=timestamps $(binaries) sysroot/usr/lib/.

clean:
	-rm -rf iso/ sysroot/
	-rm $(shell find . -name "*.o")
	-rm $(shell find . -name "*.d")
	-rm *.iso *.elf *.a com1.out bochslog.txt
	-rm .clangd